Work

Symmetry in Hyper Suprime-Cam Galaxy Spin Directions

Year: 2024

Type: article

Abstract: We perform a Bayesian analysis of anisotropy in binary galaxy spin directions in the Hyper-Suprime Cam Data Release 3 catalog, in response to a recent claim that it exhibits a dipole. We find no significant evidence for anisotropy, or for a direction-independent spin probability that differs from 0.5. These results are unchanged allowing for a quadrupole or simply searching for a fixed anisotropy between any two hemispheres, and the Bayes factor indicates decisive evidence for the isotropic model. Our principled method contrasts with the statistic employed by Shamir, which lacks a strong theoretical foundation. Our code is available at ✎ .

Source: Research Notes of the AAS

DOI: 10.3847/2515-5172/ad8fb1

Authors: Richard Stiskalek, Harry Desmond

Language: English

Topic: Galaxies: Formation, Evolution, Phenomena

Subfield: Astronomy and Astrophysics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: hybrid

Funders: Royal Society, Science and Technology Facilities Council, Balliol College, University of Oxford

Awards: STFC Oxford Physics 2022 DTP, G4496753055

OpenAlex ID: W4404229473

FWCI:

Cites: 8

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Related to: 10